Download App

Management of Natural Resources — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceManagement of Natural Resources5 Marks
Question
What are the three R’s to save the environment? Explain with one example of each.
✓

Answer

The three R’s to save the environment are:
  1. Reduce: Reduce means that we use less of the natural resources by cutting down on those practices which lead to their wastage. For example – we can reduce the wastage of electricity by switching off unnecessary lights and fans.
  2. Recycle: Recycling means that we should collect the used and discarded items of paper, plastic, glass and metals, and send them to the respective industries for making fresh paper, plastic, glass or metal objects.
  3. Reuse: Reuse means that we should use the same things again. For example plastic jars in which we buy various food items like Jams, pickles etc, can be used later on for storing things like salt and sugar.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 marks Questions]" from Management of Natural Resources→Management of Natural Resources — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed:
  1. At the centre of curvature of a concave mirror.
  2. Between the pole P and focus F of a concave mirror.
  3. In front of a convex mirror.
  4. At 2f of a convex lens.
  5. In front of a concave lens.
→
A part of the early classification of elements has been given below:
$\text{H}\ \ \ \ \ \ \ \text{Li} \ \ \ \ \ \ \ \text{Be} \ \ \ \ \ \ \ \ \ \text{B}\ \ \ \ \ \ \ \text{C}\ \ \ \ \ \ \ \text{N}\ \ \ \ \ \ \ \text{O}\\\text{F}\ \ \ \ \ \ \ \text{Na}\ \ \ \ \ \ \text{Mg}\ \ \ \ \ \ \ \text{Al}\ \ \ \ \ \ \text{Si}\ \ \ \ \ \ \ \text{P}\ \ \ \ \ \ \ \ \text{S}$
  1. Which law of classification of element is illustrated by the above arrangement of elements?
  2. Name the scientist who proposed such a classification of elements.
  3. Why is such a classification of elements compared with a characteristics of musical scale?
  4. State one limitation of this classification of elements.
→
Which is the process used to harness nuclear energy these days? Explain it briefly.
→
An organic compound $A$ having the molecular formula $C _3 H _8 O$ is a liquid at room temperature. The organic liquid $A$ reacts with sodium metal to evolve a gas which burns causing a little explosion. When the organic liquid A heated with concentrated sulphuric acid at $170^{\circ} C$, it forms a compound $B$ which decolourizes bromine water. The compound $B$ adds on one molecule of hydrogen in the presence of Ni as catalyst to forms compound C which gives substitution reactions with chlorine.
a. What is compound $A$ ?
b. What is compound $B$ ?
c. What type of reaction occurs when $A$ is converted into $B$ ?
d. What is compound C ?
e. What type of reaction takes place when B is converted into C ?
→
In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers.
Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.
→
A student did an experiment with a convex lens. He put an object at different distances 25cm, 30cm, 40cm, 60cm and 120cm from the lens. In each case he measured the distance of the image from the lens. His results were 100cm, 24cm, 60cm, 30cm and 40cm, respectively. Unfortunately his results are written in wrong order:
  1. Rewrite the image distances in the correct order.
  2. What would be the image distance if the object distance was 90cm?
  3. Which of the object distances gives the biggest image?
  4. What is the focal length of this lens?
→
A black metal oxide XO is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO is also used in ordinary dry cells. The metal oxide XO cannot be reduced satisfactorily with carbon to form metal X.
  1. Name the metal X.
  2. Name the metal oxide XO.
  3. Which reducing agent can be used to reduce XO to obtain metal X?
  4. Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
→
With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.
→
Three incandescent bulbs of 100W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.
  1. Will the bulb in the two circuits glow with the same brightness? Justify your answer.
  2. Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.
→
  1. Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.
  2. Draw a diagram of human respiratory system and label-pharynx, trachea, lungs, diaphragm and alveolar sac on it.
→